Another major contribution to SEI growth arises from the state of charge. We observe in Figure REF  that the SEI current closely follows the anode OCV-curve (see Figure SI-1), in line with the experimental results of Keil et al. [1]}, [2]} and the model of Single et al. [3]}. This dependence causes cells stored at 60% SoC to age nearly four times as fast as cells stored at 50% SoC, while storage at 80% leads to a similar capacity fade as storage at 60%.
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